When you need to install cable or wires inside a firewall or smoke wall, our Membrane Firestop Cable Sleeve is uniquely qualified for the job. Our angled design allows a BUNDLE of cables to be dropped inside a Firewall Membrane. This multi-cable system maintains proper bend radius specs.This UNIQUE product is an angled firestop cable sleeve that can cuts its own hole and installs in 2 minutes, allowing for a UL Classified path to fish cables inside a firewall. The System creates its own hole with the sharp point on the back side of the sleeve. A bead of intumenscent firestop caulk not included is applied to the back of the system and the sleeve is secured to the wall with the supplied expanding anchors. UNIQUE Intumescent Putty for sealing this firestopping system is included.UL classified for fire-rated gypsum board/stud walls for pentrations one side for up to 2 hours.